Material removing device



May 19, 1964 R. B. FREED MATERIAL REMOVING DEVICE Filed Oct. 9, 1962 FIE--3- INVENTOR. ROBERT B. FREED @fir/ Ll ATTORNEYS United States Patent 3,133,381 MATERIAL REMOVING DEVICE Robert B. Freed, 1325 Solano Ave., Albany, Calif. Filed Oct. 9, 1962, Ser. No. 229,440 8 Claims. (CI. 51-59) This invention relates to material removing devices and more particularly to reciprocating devices for removing material from a work piece by grinding, lapping, polishing and the like.

It is an object of this invention to provide a material removing device which may be operated very easily and efiiciently and which is particularly adapted for precise finishing operations in the manufacture of precision parts.

It is another object of the invention to provide such a material removing device which may be driven by drive means having a minimum of power requirement commensurate with the power applied to the work piece.

It is another object of the invention to provide such a material removing device in which work piece engaging I tools may be supported for very simple replacement while permitting the tool to be positively driven.

It is another object of the invention to provide such a device in which a minimum of frictional resistance is provided in opposition to movement of the Work engaging tool along its working strokes.

Other objects and advantages of the invention will become apparent from the following description read in conjunction with the attached drawings in which:

FIG. 1 is a plan view of a device constructed in accordance with the principles of this invention;

FIG. 2 is a view in end elevation of the device of FIG. 1;

FIG. 3 is an enlarged sectional view of one element of the apparatus of FIG. 1, and

FIG. 4 is a view similar to FIG. 3 but showing an alternative tool for use with the device.

Referring now in detail to FIG. 1, the material removing device therein includes a frame indicated generally as a plate on which is mounted a motor 12 a pinion gear 14 and a lever finger 16. The gear 14 is mounted for rotation about an axle 18, and the finger 16 is mounted for pivotal movement about an axle 20.

The motor 12 carries a worm gear 22 in mesh with pinion 14, and the finger 16 is connected to the pinion gear 14 by an eccentric crank arm 24 by means of which the finger 16 is reciprocated back and forth responsive to operation of the motor 12..

A pair of fianged guide rollers 26 are mounted for free rotation on the frame 10 by axles 28. The rollers 26 have peripheral portions between their flanges as indicated by the dotted lines in FIG. 1, with these peripheral portions defining a plane at one end of the frame 10 for supporting a tool carrier strip 30 for reciprocating movement. The carrier strip 30 is held in place against the peripheries of the rollers 26 by a magnet 32 which is mounted on a bracket 34 on the frame 10 between the rollers 26. The tool carrier strip 30 is made of steel or other suitable ferromagnetic material so that it is attracted toward the magnet 32. The magnet 32 is mounted slightly to the right of a plane tangent to the rollers 26 as the apparatus is viewed in FIG. 1 so that the magnet 32 holds the strip 30 in engagement with the rollers but the magnet is itself out of engagement with the strip 30.

The strip 30 has a tapered aperture 36 therein in which the free end of the finger 16 is received so that the finger 16 positively drives the carrier strip 30 back and forth over the rollers 26 as the motor 12 operates. A honing bar 38 is mounted on the strip 30 by means not shown so that the bar may engage a work piece and hone the same responsive to reciprocating movement of the strip 30. As one honing bar 38 becomes worn or as it may be desired to employ material removing tools of different texture, the carrier strip 30 and bar 38 are lifted off of the rollers 26 and replaced by another strip 30 and material removing tool 38. In this regard it should be noted that no positive attachment means is provided between the free end of the finger 16 and strip 30 so that the strip 30 is held in place solely by the attraction of magnet 32. A variety of material removing tools are provided for mounting on the rollers 26, for instance the tool shown in FIG. 4 where a rasp 40 is mounted on legs 42 which are attached to the strip carrier 30.

While one specific embodiment of the invention has been illustrated and described in detail herein, it is obvious that many modifications thereof may be made without departing from the spirit and scope of the invention.

I claim:

1. In a reciprocating tool for removing material from a work piece, the combination of a frame member, a tool, a carrier member for said tool, antifriction guide means having an open side interconnecting said members and supporting said carrier member for reciprocating movement with respect to said frame member, one of said members having a ferromagnetic portion, a magnet mounted on the other of said members adjacent to but out of contact with the ferromagnetic portion of said one member and adapted to maintain said carrier member in engagement with said-antifriction means, and drive means for imparting a back and forth movement to said carrier member with respect to said frame member.

2. The reciprocating tool of claim 1 in which said drive means comprises a finger mounted on said frame member for oscillating movement and having a free end in driving engagement with said carrier member for free removal of said carrier member from said finger as one of said members is moved away from said open side of said antifriction means.

3. In a reciprocating tool for removing material from a work piece, the combination of a frame, a tool, a ferromagnetic carrier member for said tool, a plurality of guide rollers mounted on said frame and supporting said member for reciprocating movement with respect to said frame, a magnet mounted on said frame adjacent said member and holding said member in engagement with said rollers while providing no frictional contact between said member and said frame, and drive means for imparting back and forth movement to said member with respect to said frame.

4. In a reciprocating tool for removing material from a work piece, the combination of a frame, a tool, a carrier member for said tool having a ferromagnetic portion thereof, a plurality of guide rollers mounted on said frame and supporting said member for reciprocating movement with respect to said frame, a magnet mounted on said frame adjacent to but out of contact with said ferromagnetic portion of said member and adapted to maintain said member in engagement with said rollers, and drive means for imparting a back and forth movement to said member with respect to said frame.

5. The combination of claim 4 in which an aperture is provided in said member extending generally perpendicular to the path of reciprocating movement of said member and in which said drive means comprises a finger mounted on said frame for oscillating movement, said finger having a free end received in said aperture for positively driving said member along said path while permitting said member to be freely removed from said finger in a direction perpendicular to said path.

6. In a reciprocating tool for removing material, the combination of a steel strip carrier for the tool element, a plurality of guide rollers supporting the carrier for reciprocating movement, a magnet disposed adjacent to but out of contact with the carrier and adapted to maintain the carrier in engagement with said guide rollers, and means for imparting a back and forth movement to said carrier.

7. In a reciprocating tool for removing material, the combination of a frame, a tool, a pair of guide rollers mounted on said frame and having peripheral portions which define a plane and flanges on both sides of said peripheral portions, an elongated carrier member for said tool engaging said peripheral portions of said rollers between said flanges and having a ferromagnetic portion between said rollers and an aperture extending generally perpendicular to said plane, a magnetmounted on said frame between said rollers adjacent to but out of contact with said ferromagnetic portion of said member, a finger having a free end received in said aperture for free movement out of said aperture in a direction generally perpendicular to said plane, and drive means interconnecting said finger and said frame for moving said free end of said finger back and forth longitudinally With respect to said member.

8. In a reciprocating tool for removing material from a Work piece, the combination of a frame member, a tool, a carrier member for said tool, antifriction guide means mounted on one of said members and having an open side engaging the other of said members for guiding said other member along a path of reciprocation parallel to said open side, one of said members having a ferromagnetic portion, a magnet mounted on the other of said members adjacent to but spaced from said ferromagnetic portion and thereby holding said other member and said open side of said antifriction means in engagement with each other, and drive means interconnecting said members for reciprocating said member engaging said guide means along said path While permitting movement of said members apart in a direction perpendicular to said path.

References Cited in the file of this patent UNITED STATES PATENTS 580,055 Moses Apr. 6, 1897 1,141,095 Ackerman June 1, 1915 1,241,027 Sander Sept. 25, 1917 2,012,555 Walker Aug. 27, 1935 2,104,062 Temple Jan. 4, 1938 2,113,290 Benjamin Apr. 5, 1938 2,668,975 Narajowski Feb. 16, 1954 2,703,116 Conover Mar. 1, 1955 3,052,950 Civitelli Sept. 1, 1962 FOREIGN PATENTS 352,673 Germany May 3, 1922 i 

6. IN A RECIPROCATING TOOL REMOVING MATERIAL, THE COMBINATION OF A STEEL STRIP CARRIER FOR THE TOOL ELEMENT, A PLURALITY OF GUIDE ROLLERS SUPPORTING THE CARRIER FOR RECIPROCATING MOVEMENT, A MAGNET DISPOSED ADJACENT TO BUT OUT OF CONTACT WITH THE CARRIER AND ADAPTED TO MAINTAIN THE CARRIER IN ENGAGEMENT WITH SAID GUIDE ROLLERS, AND MEANS FOR IMPARTING A BACK AND FORTH MOVEMENT TO SAID CARRIER. 